A controllable middle and high roller

Abstract

The invention provides a controllable crown roll and belongs to the technical field of papermaking equipment. The controllable crown roll is characterized in that a containing groove (8) is formed in the side face of a mandrel (1), an oil inlet hole (10) communicated with a static-pressure bearing piston (2) and a transition hole (13) communicated with the end face of the mandrel (1) are formed in the containing groove (8), and an oil pipe (12) communicated with the transition hole (13) and the oil inlet hole (10) is arranged in the containing groove (8). The containing groove is formed in the side face of the mandrel of the controllable crown roll, the oil pipe is installed in the containing groove, hydraulic oil is conveyed to the static-pressure bearing piston through the oil inlet hole and the transition hole in the containing groove, an axial through hole does not need to be machined in the middle of the mandrel during machining, and machining difficulty is greatly reduced. Besides, installation is convenient, the sealing requirement is low, maintenance is hardly needed, people only need to replace the damaged oil pipe or a sealing element, and maintenance difficulty is greatly reduced.

Description

technical field [0001] A controllable middle-high roller belongs to the technical field of papermaking equipment. Background technique [0002] In the papermaking production line, the calender is the key equipment to determine the paper quality index. Now the widely used soft calender equipped with hot roll and controllable middle and high roll can meet the needs of different paper grades for calendering and finishing. The controllable mid-height roll is an important part of the soft calender. The heat roll and the controllable mid-height roll are pressed against each other. Since the surface of the controllable mid-height roll is covered with composite materials, it will deform under the extrusion of the hot roll. As a result, the radius of the pressing part is reduced, and the linear speed of the deformation zone is reduced, and then the pressing part of the controllable middle-high roller will slide relative to the pressing part of the hot roller, thereby calendering the ...

AI Technical Summary

Problems solved by technology

The problems that such setting exists are: 1, processing difficulty, because the length of mandrel is longer, it is difficult to offer axial through hole on mandrel, and increased processing cost greatly; 2, inconvenient maintenance, because all The oil pipes all extend into the through hole of the mandrel, and all the oil pipes need to be taken out during maintenance, which greatly affects the work efficiency; 3. The sealing requirements are high, because the oil pipes need to transport the hydraulic oil to different pressure areas, so the oil pipes and The partitions in each press area need to be sealed, which increases the sealing requirements and also brings difficulties to maintenance

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